Answer :
Answer: We can point out two main reasons: atoms and molecules are too small to bee seen without the help of complex equipments and there are too many particles (atoms or molecules) in a small amount of substance (6.022 x 10^23 particles per mol of substance).
Explanation:
The question requires us to explain why atoms and/or molecules can't be count in dozen.
We can point out two main reasons for why it is not practical to count atoms and molecules the way we do with donuts and eggs, for example:
- The first one is the size of this particles. We need powerful and complex equipments to be able to see atoms and molecules. The size of atoms, for example, is measured in Angstroms, which corresponds to 10^-10 meters. Although molecules are slightly bigger, they are still too small to be seen without complex microscopes.
- Considering that we were able to see atoms and molecules in order to count them, there would be another issue: the amount of atoms and/or molecules contained in small amount of substances is too big. For example: let's consider 18 g of water, which corresponds to approximately 1 mol of this substance; in 18 g of water there are 6.022 x 10^23 molecules of water - which is way more complex than counting a dozen (12) units of donuts, for example.
